Question

我已经在按钮按下时实现了时间选择器，这些时间选择器位于一个片段（Work）中，但是我如何仅使用一个onTimeSet（）来提取两个对话框的小时和分钟来分隔变量。位于MainActivity中？

这是我的onTimeSet()中的我的MainActivity：

    public void onTimeSet(TimePicker timePicker, int i, int i1) {
        TextView textView = (TextView)findViewById(R.id.textstart);
        textView.setText("Hour: "+ i + " Minutes: "+ i1);

        getSupportFragmentManager().getFragments();

    }

这是我的Work片段：

Button timeButton = (Button) view.findViewById(R.id.timeButton);
        timeButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                DialogFragment timePicker = new TimePicker_Fragment();
                timePicker.show(getFragmentManager(), "Time Picker");
            }
        });

        Button timeButton2 = (Button) view.findViewById(R.id.timeButton2);
        timeButton2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                DialogFragment timePicker2 = new TimePicker_Fragment();
                timePicker2.show(getFragmentManager(), "Time Picker 2");
            }
        });

        return view;
    }

Answer 1

一种选择是更改应用程序的体系结构：

由于TimePickerFragment是唯一可以理解TimePicker中onTimeSet()参数的参数，因此这是实现TimePickerDialog.OnTimeSetListener的逻辑选择。

TimePicker_Fragment的两个实例可以通过某些自定义界面报告给主机WorkFragment（并最终向Activity）报告。在您的String的自定义版本中使用一些唯一值（一个onTimeSet()或一个枚举）来标识它们。

例如，您的“活动”可以实现以下方法：

@Override
void onCustomTimeSet(String timePickerId, int hour, int minutes){
    switch(timePickerId){
        case "TIME_PICKER":
            // code for time  picker 1 here
            break;
        case "TIME_PICKER_2":
            // code for time  picker 1 here
            break;
    }
    // ...
}

...将由onTimeSet(TimePicker, int, int)中的“正常” TimePicker_Fragment的实现调用

@Override
void onTimeSet(TimePicker timePicker, int i, int i2){
    ((CustomTimePickerListener)getActivity()).onCustomTimeSet("TIME_PICKER_1", i, i2)
}

另一种选择是利用TimePicker是View的事实，并且View可以具有 tag （可以是任何Object的类型，请参见View.setTag()）。

因此，您可以TimePicker_Fragment为TimePicker设置标签。

由于TimePicker是TimePickerDialog的一部分，所以设置 tag 的最简单方法似乎是（再次）TimePicker_Fragment实现{{ 1}}。但是这次，TimePickerDialog.OnTimeSetListener可以实现相同的接口：

Activity中的代码

TimePicker_Fragment

void onTimeSet(TimePicker timePicker, int i, int i2){ timePicker.setTag("TIME_PICKER"); ((TimePickerDialog.OnTimeSetListener)getActivity()).onTimeSet(timePicker, i, i2); }中的代码

Activity

为三个相关组件实现第二种解决方案的代码：

MainActivity.java

void onTimeSet(TimePicker timePicker, int i, int i2){
    String tag = (String)timePicker.getTag();
    switch(tag){
        case "TIME_PICKER":
            // code for time  picker 1 here
            break;
        case "TIME_PICKER_2":
            // code for time  picker 2 here
            break;
    }
    // ...
}

Work.java

public class MainActivity extends AppCompatActivity implements TimePickerDialog.OnTimeSetListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, new Work()).commit();
    }

    public void onTimeSet(TimePicker timePicker, int i, int i1){
        String tag = (String)timePicker.getTag();
        switch(tag){
            case TIME_PICKER:
                TextView textView = (TextView)findViewById(R.id.textstart);
                textView.setText("Start Hour: "+ i + " Minutes: "+ i1);
                break;
            case TIME_PICKER_2:
                TextView textView2 = (TextView)findViewById(R.id.textend);
                textView2.setText("Start Hour: "+ i + " Minutes: "+ i1);
                break;
        }
    }
}

TimePicker_Fragment.java

public class Work extends Fragment {

    public static final String TIME_PICKER = "TIME_PICKER";
    public static final String TIME_PICKER_2 = "TIME_PICKER_2";

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.frag_work, container, false);
        getActivity().setTitle("Work");

        Button timeButton = (Button) view.findViewById(R.id.btn1);
        timeButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                DialogFragment timePicker = TimePicker_Fragment.instance(TIME_PICKER);
                timePicker.show(getFragmentManager(), "Time Picker");
            }
        });

        Button timeButton2 = (Button) view.findViewById(R.id.btn2);
        timeButton2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                DialogFragment timePicker2 =TimePicker_Fragment.instance(TIME_PICKER_2);
                timePicker2.show(getFragmentManager(), "Time Picker 2");
            }
        });

        return view;
    }
}

Answer 2

我不确定我是否理解这个问题。

您是否尝试过类似的方法（不确定确切的语法）：

public void onTimeSet(TimePicker timePicker, int i, int i1) {
    TextView textView = (TextView)findViewById(R.id.textstart);
    textView.setText("Hour: "+ timePicker.getHour() + " Minutes: "+ timePicker.getMinute());
}

您还可以将监听器添加到TimePicker_Fragment构造函数中，以获取新的小时和分钟。

如何在同一onTimeSet（）中提取两个时间选择器对话框的小时和分钟？

2 个答案: